This may sound like a stupid question but under the real time or daily flow charts where it has columns for Time,Flow,Gauge, BBS and Comments/Links, what does the gauge column signify measured in feet?

This may sound like a stupid question but under the real time or daily flow charts where it has columns for Time,Flow,Gauge, BBS and Comments/Links, what does the gauge column signify measured in feet?

This may sound like a stupid question but under the real time or daily flow charts where it has columns for Time,Flow,Gauge, BBS and Comments/Links, what does the gauge column signify measured in feet?